Joseph von Fraunhofer

German physicist (1787–1826)

Joseph Ritter von Fraunhofer (German: [ˈfraʊnˌhoːfɐ]; 6 March 1787 – 7 June 1826) was a German physicist and optical lens manufacturer. He made optical glass, an achromatic telescope, and objective lenses. He developed diffraction gratings and also invented the spectroscope.

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